Sodium Bicarbonate → 2-Cyclopenten-1-one, 4-hydroxy-3-methyl-2-(2-propen-1-yl)-

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Reaction Steps

In 200 ml of a 5% aqueous sodium hydrogen-carbonate solution, was dissolved 29 g of 4-hydroxy-4-methyl-5-allyl-2-cylcopentenone. The solution was heated with stirring under reflux for one hour. After having been allowed to cool, the reaction mixture was extracted three times with chloroform. The extract solution was dried over anhydrous magnesium sulfate and freed from the chloroform by distillation. The residue was distilled in vacuo to obtain 21.7 g (75% yield) of 2-allyl-3-methyl-4-hydroxy-2-cyclopentenone boiling at 155° C./1 mmHg.

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